Just another short story ...
I love theme Adwaita theme, especially the dark one. So, I always have it enabled by using GNOME Tweaks. Unfortunately, many applications do not seem to be worked pretty well in dark theme. So, I wanted to know how to run certain Flatpak application in light theme without me changing the global default theme.
In my case, WPS Office has a poor display of the font search dropdown list; black text on dark background will never be good. After googling for a while, I got to know that WPS Office was installed at
/var/lib/flatpak/app/com.wps.Office/. It seemed like all Flatpak applications will be installed either at
/var/lib/flatpak/app/for system-wide installation; or
~/.local/share/flatpak/appfor per-user installation.
Exploring the directory structure, I have realised that somehow WPS Office has included its own theme directory at
$ cd /var/lib/flatpak/app/com.wps.Office/x86_64/stable/active/files/share/themes/ $ ls Adwaita Adwaita-dark Default Emacs HighContrast Raleigh
I think, this is not common, at least not for most applications. Then, I idly experimented to remove the
Adwaita-dark folder, so that WPS Office cannot find it anymore. Or at least just to rename it;
$ sudo mv Adwaita-dark/ Adwaita-dark-bk/ $ sudo mv Adwaita/ Adwaita-dark/
Fortunately, it seemed to be worked. Yay! I have managed to force WPS Office to use the light theme instead! Although I cannot explain it.
For GTK applications, we can make sure to set the
GTK_THEME environment variable. For example, for the Color Picker application:
$ sudo flatpak override --env=GTK_THEME=Adwaita nl.hjdskes.gcolor3
To unset, just need to set the value to empty:
$ sudo flatpak override --env=GTK_THEME= nl.hjdskes.gcolor3
For Qt applications, set the
QT_STYLE_OVERRIDE variable instead.
You deserve a good day, bye!